IS/IEC 60371-3-8: Insulating Materials Based on MICA, Part 3: Specification for Individual Materials, Section 8: Mica Paper Tapes for Flame – Resistant Security Cables

17 Pages·1995·1.3 MB·English

by  Bureau of Indian Standards

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IS/IEC 60371-3-8 (1995): Insulating Materials Based on
MICA, Part 3: Specification for Individual Materials,
Section 8: Mica Paper Tapes for Flame – Resistant Security
Cables [ETD 2: Solid Electrical Insulating Materials and
Insulation Systems]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
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“Knowledge is such a treasure which cannot be stolen”

IS/IEC 60371-3-8 : 1995
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Indian Standard
SPECIFICATION FOR INSULATING
MATERIALS BASED ON MICA
PART 3 SPECIFICATIONS FOR INDIVIDUAL MATERIALS
Section 8 Mica Paper Tapes for Flame-Resistant Security Cables
ICS 29.035.50
© BIS 2012

BU R E AU O F I N D I A N S TA N DA R D S
MANAK BHAVAN, 9 B AHADUR SHAH ZAFAR MARG
NEW DELHI 110002
April 2012 Price Group 5
Solid Electrical Insulating Materials and Insulating Systems Sectional Committee, ETD 02
NATIONAL FOREWORD
This Indian Standard (Part 3/Sec 8) which is identical with IEC 60371-3-8 : 1995 ‘Insulating materials based
on mica — Part 3: Specifications for individual materials — Sheet 8: Mica paper tapes for flame-resistant
security cables’ issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau
of Indian Standards on the recommendation of the Solid Electrical Insulating Materials and Insulating Systems
Sectional Committee and approval of the Electrotechnical Division Council.
This standard is a part of series of standards based on IEC 60371 series. The committee has now decided
to adopt the IEC Standard to harmonize it with the latest developments taken place at international level.
This standard is now being published in single number based on IEC 60371 in various parts/sections. Other
parts in this series are:
Part 1 Definitions and general requirements
Part 2 Methods of test
Part 3 Specifications for individual materials,
Section 1 Commutator separators and materials
Section 2 Mica paper
Section 3 Specification for rigid mica materials for heating equipment
Section 4 Polyester film-backed mica paper with a B-stage epoxy resin binder
Section 5 Glass-backed mica paper with an epoxy resin binder for post-impregnation (VPI)
Section 6 Glass-backed mica paper with a B-stage epoxy resin binder
Section 7 Polyester film mica paper with an epoxy resin binder for single conductor taping
Section 9 Moulding micanite
The text of IEC Standard has been approved as suitable for publication as an Indian Standard without
deviations. Certain terminology and conventions are, however, not identical to those used in Indian Standards.
Attention is particularly drawn to the following:
a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as
‘Indian Standard’.
b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to
use a point (.) as the decimal marker.
In this adopted standard, reference appears to certain International Standards for which Indian Standards
also exist. The corresponding Indian Standards which are to be substituted in their respective places are
listed below along with their degree of equivalence for the editions indicated:
International Standard Corresponding Indian Standard Degree of Equivalence
IEC 60371-2 : 19871) Specification for IS/IEC 60371-2 : 2004 Specification for Technically Equivalent
insulating materials based on mica — insulating materials based on mica:
Part 2: Methods of test Part 2 Methods of test

1)Since revised in 2004.
(Continued on third cover)
IS/IEC 60371-3-8 : 1995
Indian Standard
SPECIFICATION FOR INSULATING
MATERIALS BASED ON MICA
PART 3 SPECIFICATIONS FOR INDIVIDUAL MATERIALS
Section 8 Mica Paper Tapes for Flame-Resistant Security Cables
1 Scope
This International Standard specifies the requirements for an electrical insulating material
containing mica paper with glass fabric or plastic film and impregnated with a suitable
resin. The material is supplied in a flexible state. It may be supplied in the form of sheets
or rolls. The product is designed for use in cables capable of operating after a fire.
This specification covers material having a nominal thickness from 0,05 mm to 0,15 mm.
Materials which conform to this specification meet established levels of pe rformance.
However, the selection of a material for a specific application should be based on the
actual requirements necessary for adequate performance in that application and not based
on this specification alone.
2 Normative references
The following normative documents contain provisions which, through reference in this
text, constitute provisions of this International Standard. At the time of publication, the
editions indicated were valid. All normative documents are subject to revision, and pa rties
to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated
below. Members of IEC and ISO maintain registers of currently valid International
Standards.
IEC 371-2: 1987, Specification for insulating materials based on mica - Part 2: Methods
of test
IEC 371-3-2: 1991, Specification for insulating materials based on mica - Part 3: Speci-
fications for individual materials - Sheet 2: Mica paper
3 Designation
When ordering material to this specification, only the specification and type numbers need
be quoted (see tables 1, 2, 3 and 4).
Example: IEC 371-3-8: type 8.1.01
The type number is derived from:
-(cid:9) the specification sheet number 8
-(cid:9) plus the sheet table number 8.1
-(cid:9) plus the number of the product in th e sheet table 8.1.01.
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371-3-8 © IEC:1995(cid:9) - 9 -
IS/IEC 60371-3-8 : 1995
The descriptive code quoted in table 1, i.e. G23/M50/R20 for type 8.1.01, table 1, is
derived from:
- glass content (G) 23 g/m2
- muscovite mica content (M) 50 g/m2
- resin content (R) 20 g/m2.
NOTE - If film is used instead of glass, the thickness of the film (in µm) is used in the descriptive code,
see IEC 371-3-7, clause 3.
4 Requirements: raw materials
4.1 Mica paper
Mica paper referred to in this specification shall comply with the requirements of IEC 371-3-2.
4.2 Glass fabric
Normally the glass fabric shall be in the loom state and shall have a size content not
greater than 3 % by weight. By agreement between purchaser and seller, it may be
treated.
4.3 Film
As an alternative to glass fabric, films may be used as the backing material. The type of
film should be subject to the purchase contract.
Table 1 - Composition for glass fabric and calcined muscovite mica paper
(IEC 371-3-2, classes 1 and 2)
Glass Mica Resin Mass/ Permissible
content content content unit area thickness range Volatile
Descriptive content
Type code g/m2 g/m2 g/m2 g/m2 mm
Nom. Tol. Nom. Tol. Nom. Tol. Nom. Tol. Mean Individual Max. %
± ± ± ±
8.1.01 G23/M50/R20 23 2 50 4 20 5 93 9 0,07-0,09 0,06-0,10 1,0
8.1.02 G23/M60/R21 23 2 60 5 21 5 104 11 0,07-0,09 0,06-0,10 1,0
8.1.03 G23/M75/R32 23 2 75 6 32 7 130 13 0,10-0,12 0,09-0,13 1,0
8.1.04 G23/M90/R34 23 2 90 8 34 8 147 15 0,10-0,12 0,09-0,13 1,0
8.1.05 G23/M 120/R40 23 2 120 10 40 9 183 18 0,12-0,15 0,11-0,16 1,0
NOTE - Combinations with other g ass fabrics are possible.

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371-3-8 © IEC:1995
IS/IEC 60371-3-8 : 1995
Table 2 - Composition for glass fabric and uncalcined muscovite and
phiogopite mica paper (IEC 371-3-2, classes 3 and 4)
Glass Mica Resin Mass/ Permissible
content content content unit area thickness range Volatile
Descriptive content
Type
code g/m2 g/m2 g/m2 g/m2 mm
Nom. Tol. Nom. Tol. Nom. Tol. Nom. Tol. Mean Individual Max. %
t t t t
8.2.01 G23/P60/R16 23 2 60 5 16 4 99 10 0,07-0,09 0,06-0,10 1,0
8.2.02 G23/P75/R18 23 2 75 6 18 4 116 12 0,10-0,12 0,09-0,13 1,0
8.2.03 G23/P80/R18 23 2 80 7 18 4 121 12 0,10-0,12 0,09-0,13 1,0
8.2.04 G23/M80/R18 23 2 80 7 18 4 121 12 0,10-0,12 0,09-0,13 1,0
8.2.05 G23/P90/R21 23 2 90 8 21 5 134 13 0,10-0,12 0,09-0,13 1,0
8.2.06 G23/M90/R21 23 2 90 8 21 5 134 13 0,10-0,12 0,09-0,13 1,0
8.2.07 G32/P120/R23 32 3 120 10 23 6 175 18 0,12-0,14 0,11-0,16 1,0
8.2.08 G32/M120/R23 32 3 120 10 23 6 175 18 0,12-0,14 0,11-0,16 1,0
8.2.09 G32/P160/R30 32 3 160 14 30 7 222 22 0,13-0,16 0,12-0,17 1,0
8.2.10 G32/M160/R30 32 3 160 14 30 7 222 22 0,13-0,16 0,12-0,17 1,0
NOTE - Combinations with other g ass fabrics are possible.
Table 3 - Composition for film and calcined muscovite mica paper
(IEC 371-3-2, classes 1 and 2)
Film Mica Resin Mass/ Permissible
content content content unit area thickness range Volatile
Descriptive content
Type
code g/m2 g/m2 g/m2 g/m2 mm
Nom. Tol. Nom. Tol. Nom. Tol. Nom. Tol. Mean Individual Max. %
t ± t t
8.3.01 F23/M50/R14 34 5 50 4 14 5 98 10 0,05-0,08 0,04-0,09 1,0
8.3.02 F23/M60/R14 34 5 60 5 14 5 108 11 0,05-0,08 0,04-0,09 1,0
8.3.03 F23/M75/R16 34 5 75 6 16 5 125 13 0,06-0,09 0,05-0,10 1,0
8.3.04 F23/M90/R18 34 5 90 8 18 6 142 14 0,06-0,09 0,05-0,10 1,0
8.3.05 F23/M120/R20 34 5 120 10 20 6 174 17 0,10-0,12 0,09-0,13 1,0
NOTE - Combinations with other film thicknesses are possible.

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371-3-8 © IEC:1995 - 13 -
IS/IEC 60371-3-8 : 1995
Table 4 - Composition for film and uncalcined muscovite and phlogopite
mica paper (IEC 371-3-2, classes 3 and 4)
Film Mica Resin Mass/ Permissible
content content content unit area thickness range Volatile
Type Descriptive content
code g/m2 g/m2 g/m2 g/m2 mm
Nom. Tol. Nom. Tol. Nom. Tol. Nom. Tol. Mean Individual Max. %
± ± ± ±
8.4.01 F23/P60/R11 34 5 60 5 11 4 105 11 0,05-0,08 0,04-0,09 1,0
8.4.02 F23/P75/R15 34 5 75 6 15 5 124 12 0,06-0,09 0,05-0,10 1,0
8.4.03 F23/P80/R15 34 5 80 7 15 5 129 13 0,06-0,09 0,05-0,10 1,0
8.4.04 F23/M80/R15 34 5 80 7 15 5 129 13 0,06-0,09 0,05-0,10 1,0
8.4.05 F23/P90/R16 34 5 90 8 16 6 140 15 0,06-0,09 0,05-0,10 1,0
8.4.06 F23/M90/R16 34 5 90 8 16 6 140 15 0,06-0,09 0,05-0,10 1,0
8.4.07 F23/P120/R22 34 5 120 10 22 6 176 18 0,10-0,12 0,09-0,13 1,0
8.4.08 F23/M120/R22 34 5 120 10 22 6 176 18 0,10-0,12 0,09-0,13 1,0
8.4.09 F23/P160/R32 34 5 160 14 32 9 226 23 0,11-0,13 0,10-0,14 1,0
8.4.10 F23/M160/R32 34 5 160 14 32 9 226 23 0,11-0,13 0,10-0,14 1,0
NOTE - Combinations with other film thicknesses are possible.
4.4 Resin
Any resin system may be used which enables the material to meet the requirements of this
specification.
5 Requirements: composition and tolerances
When tested by the method of clause 6 of IEC 371-2 the composition of the products shall
lie within the limits of tables 1 to 4 for the appropriate grade of mica paper.
6 Requirements of material (as received)
6.1 General
All materials in any one consignment shall have the same properties, within the limits of
this specification, throughout the length of each roll.
The surfaces shall be uniform and free from defects such as bubbles, pin-holes, creases
and flaws.
Material supplied in rolls shall be capable of being unrolled continuously without damage,
and the force required to unroll the material shall be substantially uniform.
Unless otherwise specified in the purchase contract, the material shall be rolled with the
mica surface on the outside.
6.2 Width
This specification contains no requirements for widths of tape. However, the following
widths are preferred: 6 mm, 8 mm, 10 mm, 12 mm, 15 mm, 20 mm, 25 mm, 30 mm, 40 mm
and 50 mm.

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371-3-8 © IEC:1995(cid:9) –15 – IS/IEC 60371-3-8 : 1995
The maximum trimmed width of full width material and sheet normally available is
1 000 mm.
The tolerance on the width of the material shall be as in table 5.
Table 5 – Tolerance on width
Nominal width Tolerance
mm mm
5 20 ±0,5
>205500 ±1,0
> 500 ±5,0
6.3 Thickness
Measure the thickness in accordance with clause 3 of IEC 371-2, using the appropriate
apparatus given in 3.1.1 of that standard, making 10 measurements on one thickness of
material.
The measured values shall be in accordance with the requirements given in tables 1 to 4.
6.4 Length
There are no requirements in this specification for roll length, and these should therefore
be subject to the purchase contract.
Preferred lengths are 250 m, 500 m and 750 m.
6.5 Cores
The tape shall be supplied compactly wound on cores of 76 mm interior diameter which
shall be free from sharp edges.
The width of the cores in relation to that of the tape should be subject to the purchase
contract.
Full width material and material wider than 100 mm shall be supplied on 55 mm or 76 mm
cores.
6.6 Joins
The number of rolls with joins shall be limited to 25 % of any one consignment. Joined
rolls of length less than or equal to 300 m shall contain no more than one join.
The number of joins in rolls of length greater than 300 m and the method of making the
join should be subject to the purchase contract.

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